A Modbus RS485 connects a Master device to one or more Slave devices. There is also the GSM version; especially useful when only one sensor is needed in a remote location where other types of transmission cannot be used. It is interesting to measure the humidity of the ground, but we have also thought about other things; and then we have TXtemp to measure the temperature (one of the uses of TXtemp is in association with SuperClock), and for practically any type of measurement we have TXdata (RS232, RS485 ModBus) - which can be connected to thousands of existing third-party professional RS232 or ModBus meters (and there is something for all needs: temperature and humidity meters, anemometers, voltage meters, energy, light meters, water meters, presence sensors, brightness sensors, soil humidity sensors, etc. ; practically all professional meters are available in ModBus or RS232 standard; and not just meters). TXsoil is a compact and low consumption sensor that can measure and transmit the humidity of the ground WiFi or RF or GSM. TXSoil can transmit the humidity to a Web server or to a VisualVision's display / concentrator such as DisplayRX or ControlHUB or RXTXeasy GSM - with adjustable interval, remaining for the rest of the time in standby with very low consumption.

TXsoil can be configured and read with a smartphone or PC, with just a few clicks. If you do not receive it within a few minutes, check the "Spam" folder of your mail program or Gmail or other. We ship small quantities of stock items the same day and larger quantities in a few days. In order to avoid errors when many devices are connected, cables of the same colour should be used for all the connections to the terminals A and cables of the same colour should be used for all the connections to the terminals B of the various devices (e.g. white for A and blue for B). The A signals of all devices should be connected with each other and the same goes for the B signals. These signals are commonly called A and B in RS485 systems. 24 AWG solid wires, which are typically used in Cat 5 cables, can break easily when connected to a screw terminal block, which does not provide any strain relief. Easy hookup: Fixed/removable screw terminals, USB, RJ11/12/45, and barrel connectors.

Each device has a communication port with two terminals, which are indicated for the sake of convenience as A and B. In these two terminals the communication cable is connected so that all the devices that take part in the communication are connected in parallel. Two wire telephone cables will not function because in that case the ground signal levels on both sides will be floating. The most common cable type is Cat 5e-UTP (unshielded twisted pair) which may work over shorter distances in less demanding applications with low EMI noise levels. The primary occasion for using RS485 cables is to create a network where multiple devices, such as sensors, controllers, or instruments, must communicate over relatively long distances. End of line termination resistor (120 ohm 1/4 watt) to be installed at both ends of network. RS485 Bias : 470 Ohm pull-up and pull-down (jumper selectable). In order to avoid signal reflections, a 120 Ohm termination resistance must be fitted on each end of the main cable. Buy by filling out the order form below. After connecting as for point B, in the Settings it is possible to define a name for the device, and if the reading periodicity is less than 250 minutes, you can set an interval of hours in which the reading is not carried out / transmitted (for example you can disable the night).

Figure 1 shows an example of a correct Bus connection. The adapter includes a 3 foot 'type A' cable connection that plugs into any PC or MAC USB port. Be sure to use a wire pair such as the blue and blue/white pair for the data lines and a third wire or pair twisted together for the common connection. 3106A is what I typically use to wire balanced audio. Now there was certain instances I used STP wire for rs485 because I had a lot of devices connected in a long run chain (DMX512 lighting fixtures). In addition to the serpentine pair configuration, STP cables feature a metallic shield surrounding the conductors. All communication cabling to be installed in a daisy chain configuration, no T’s are permitted. Henceforth, we shall consider Slave devices to be measuring instruments with serial communication, even if the cabling is similar for all Modbus devices.

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